Physical Inspection & Repair:

• Paint the chassis if neccessary
• Replace missing parts such as screws, cover plates
• Repair common damaged parts such as pins, cables
• Visually inspect the printed circuit boards to make sure it’s intact

Functional Tests & Diagnostics:

• Power-on and bootup test
• Reset to factory defaults
• Memory and file system tests
• Run built-in in-depth diagnostics on each component

RF & Connectivity tests:

• Measure RF signal strength and quality on each downstream RF port
• Verify return-path connectivity on each upstream port
• Connectivity test using real modems
• Verify channel bonding capabilities
• Check ethernet and SFP/XFP ports

Stress test:

• Verify stability under heavy load by connecting a batch of modems generatic constant maximum traffic
• Bandwidth tests to verify throughput
• Check bit error rates on all interfaces